<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
 <script>
    function f1(){
        console.log("f1(){}")
    }
    function f1(){
        console.log("f1()。。。。。。")
    }
    f1();

    (function (a,b){return a+b;})()


 </script>
</body>
</html>